ABSTRACT

Bi – Mg is a strongly interacting system (the free energy of mixing $G_M$> 3 RT at equiatomic composition), the compositional dependence of the thermodynamic properties (free energy of mixing, heat of mixing and entropy of mixing) exhibits asymmetric behaviour about equiatomic composition and are in well agreement with experimental data literature. Such an interesting feature is explained here through complex formation model on the basis that a complex of the form Bi₂Mg₃ exists in the bulk phase. Its energetics is used to investigate the structural properties (concentration fluctuation in long wavelength limit and chemical short-range order parameter) and the transport property (ratio of mutual diffusion coefficient to intrinsic diffusion coefficient). The mixing behaviour of Bi – Mg system is further explored through the study of coefficient of viscosity, surface composition and surface tension. Our study indicates that the surface is enormously rich with Bismuth concentrations throughout the composition of the alloys.

摘要

Bi – Mg 是一种强相互作用系统（混合的自由能 $G_{米}$> 3 RT at 等原子组成），热力学性质（混合自由能、混合热和混合熵）的组成依赖性表现出关于等原子组成的不对称行为，并且与实验数据文献非常一致。在此通过复合形成模型解释了这样一个有趣的特征，该模型基于形式为 Bi ₂ Mg ₃存在于体相中。其能量学用于研究结构特性（长波长极限的浓度波动和化学短程有序参数）和传输特性（相互扩散系数与本征扩散系数的比值）。通过对粘度系数、表面成分和表面张力的研究，进一步探索了 Bi-Mg 系统的混合行为。我们的研究表明，整个合金成分的表面都富含铋。